How to reorder arrange bars with in each Facet of ggplot
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One of the problems that we usually face with ggplot is that rearranging the bars in ascending or descending order. If that problem is solved using reorder() or fct_reorder(), the next problem is when we have facets and ordering bars within each facet.
Recently I came acrosss this function reorder_within() from the package tidytext (Thanks to Julia Silge and Tyler Rinker – who created this solution originally)
Example Code:
library(tidyr) library(ggplot2) iris_gathered <- gather(iris, metric, value, -Species) ggplot(iris_gathered, aes(reorder(Species, value), value)) + geom_bar(stat = 'identity') + facet_wrap(~ metric)
As you can see above, the bars in the last facet isn’t ordered properly. This is a problem you wouldn’t forget had you plotted TF_IDF or something similar with facets.
Here’s the solution
library(tidytext) # reorder_within and scale_x_reordered work. # (Note that you need to set scales = "free_x" in the facet) ggplot(iris_gathered, aes(reorder_within(Species, value, metric), value)) + geom_bar(stat = 'identity') + #scale_x_reordered() + facet_wrap(~ metric, scales = "free_x")
Now, that’s beautifully done with a change in function.
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